Some users in the PDX region are having trouble loading the ORCA Canvas site because it's receiving a high amount of traffic. Requests may time out or take longer than usual to complete.
Instructure Support is currently investigating the issue, and will update their status page once they have found a fix. You can keep up with their status page from the URL below:
https://status.instructure.com/
UPDATE 8/31 1:23pm: A fix has been implemented and Canvas is monitoring the results.